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Psilan
779 posts

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  #2056452 15-Jul-2018 14:04
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I would just ask the builder/installer if that part was done.


Psilan
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  #2056453 15-Jul-2018 14:04
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I would just ask the builder/installer if that part was done.


nunz
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  #2056475 15-Jul-2018 14:49
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gchiu:

 

I was up on the roof today to take pictures for the building inspector.  The Cromwell was installed yesterday.

 

I was trying to find out what the flashing should be and just saw this.  And the restraint looks to be an old rusty bit of pipe work yell

 

Anyway, should this be flashed with EPDM membrane?

 

 

 

 

 

did they spill the paint on the right hand side of the chimney? Why the long run of grey paint?

 

Also if that is primer you want to get it painted with top coat as primers can be water loving.

 

 


mattwnz
18657 posts

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  #2056485 15-Jul-2018 15:29
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Is the flashing welded to  the flashing? Wheres the rubber boot?


gchiu
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DR

  #2056529 15-Jul-2018 16:15
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mattwnz:

 

Is the flashing welded to  the flashing? Wheres the rubber boot?

 

 

 

 

These are the questions I've asked the solid fuel installer.


gchiu
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DR

  #2056532 15-Jul-2018 16:18
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nunz:

 

did they spill the paint on the right hand side of the chimney? Why the long run of grey paint?

 

Also if that is primer you want to get it painted with top coat as primers can be water loving.

 

 

That paint stuff was put there by the plumbers when they came to repair a leak around the flashings of the old chimney last year.

 

This installer didn't do any painting as far as I know, not even roof tar.


gchiu
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DR

  #2056625 15-Jul-2018 19:34
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gchiu:

 

That paint stuff was put there by the plumbers when they came to repair a leak around the flashings of the old chimney last year.

 

This installer didn't do any painting as far as I know, not even roof tar.

 

 

Actually looking at my drone footage I took before the chimney was replaced I can see it was rust treatment that has been applied to the many areas of edge rust of my metal roof, and presumably where it rusted downside to the chimney where the flashings failed last year.


Lastman
297 posts

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  #2056685 15-Jul-2018 20:44
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gchiu:

mattwnz:


Is the flashing welded to  the flashing? Wheres the rubber boot?



 


These are the questions I've asked the solid fuel installer.



You should have got your building consent before the fireplace was installed, then the flashing method would be agreed by the council.

The method there is not the acceptable solution for metal profile. However, the acceptable solution for this assymmetric trapezoidal is basically the same as corrigated iron and is not very elegant when used for the trapezoid, so this might be the method approved locally.

It does seem to rely completely on sealant which is never great.

mattwnz
18657 posts

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  #2056749 15-Jul-2018 23:42
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Lastman:

The method there is not the acceptable solution for metal profile. However, the acceptable solution for this assymmetric trapezoidal is basically the same as corrigated iron and is not very elegant when used for the trapezoid, so this might be the method approved locally.
.

 

 

 

This looks like a tray deck roofing. I didn't think the flue could block 50% of the tray? I would be a bit concerned about water flow building up behind the flue, although the phjoto doesn't show how big the roof is. .  Normally way plumbers do these flashing these days is run a flashing up to the ridge flashing, and use a boot over the flue connected to this overflashing. 


Lastman
297 posts

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  #2056806 16-Jul-2018 08:32
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This is the Acceptable Solution for similar roofing (square opening but round is just flat with a boot) but hardly works well on the uphill side because the ridges for full “tray” roofing are so high.




gchiu
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DR

  #2056837 16-Jul-2018 09:20
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I did the consent myself and I just said for the flashing we would re-use the existing flashing.  But it turns out there were no existing flashings present!

 

The solution above only works for a pitch of 10 deg or more.  My roof pitch is 5 deg which doesn't seem to be covered by anything I found so far.  The EDPM membrane does appear to allow the water to flow around a penetration but I suspect there's going to be some pooling of water.  Maybe I need to ask my plumber instead of my solid fuel installer who has yet to reply to me.


Lastman
297 posts

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  #2056845 16-Jul-2018 09:34
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gchiu:

I did the consent myself and I just said for the flashing we would re-use the existing flashing.  But it turns out there were no existing flashings present!


The solution above only works for a pitch of 10 deg or more.  My roof pitch is 5 deg which doesn't seem to be covered by anything I found so far.  The EDPM membrane does appear to allow the water to flow around a penetration but I suspect there's going to be some pooling of water.  Maybe I need to ask my plumber instead of my solid fuel installer who has yet to reply to me.



If you have a consent you just need to pass an inspection to get your code of compliance.

I would just be up front and show the photo to the inspector. They will be happy with it or not, in which case, go back to the installer.

Hopefully, it is weathertight, but it’s a good idea to keep an eye on it until you are satisfied it is.

gchiu
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DR

  #2056850 16-Jul-2018 09:38
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My installer told me that the inspectors don't go onto the roof, you have to take the pictures to show them!

 

Which is why I was on the roof taking pictures frown


mattwnz
18657 posts

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  #2057244 16-Jul-2018 16:41
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gchiu:

 

I did the consent myself and I just said for the flashing we would re-use the existing flashing.  But it turns out there were no existing flashings present!

 

The solution above only works for a pitch of 10 deg or more.  My roof pitch is 5 deg which doesn't seem to be covered by anything I found so far.  The EDPM membrane does appear to allow the water to flow around a penetration but I suspect there's going to be some pooling of water.  Maybe I need to ask my plumber instead of my solid fuel installer who has yet to reply to me.

 

 

Have a look at the Metal roofing association COP website as they should have more solutions, https://www.metalroofing.org.nz/design/code_of_practice 


gchiu
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DR

  #2057258 16-Jul-2018 17:01
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I've had a chance to talk to my installer.  What he did was keep the existing outer casing of the existing flue but cut it 600 mm from the top of the roof, and at the ceiling.  He then threaded the inner lining of the new flue through it from the fireplace, and put a new external casing over the outside of the old casing, screwing it into place.  So, this kept the existing flashings which is now covered by the new external casing.  It was all puzzling because it didn't look like Masport's flue kit which I got with the fireplace.  And it turns out he never used that one.

 

Since the old flashing had failed previously and had to be patched by the plumbers, I'm a bit disappointed he did it this way.  I'd have preferred he used the kit I provided and put in a  new flashing rather than keep the one that might have been 30 years old.

 

Anyway, my council inspection is on Wednesday, and I have the kindling and wood ready for my first burn after I get the go ahead.


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